Yazar "Üstün, Kadir" için listeleme
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Broadband LWIR and MWIR metamaterial absorbers with a simple design topology: Almost perfect absorption and super-octave band operation in MWIR band
Üstün, Kadir; Turhan Sayan, Gönül (OSA - The Optical Society, 2017)Infrared absorbers are essential structures in the design of thermal emitters and thermal infrared imagers. In this study, we propose simple topologies of wideband metamaterial absorbers operating in the long-wave infrared ... -
Broadband one way propagation via dielectric waveguides with unequal effective index
Öner, Bilgehan Barış; Üstün, Kadir; Kurt, Hamza; Okyay, Ali Kemal; Turhan Sayan, Gönül (Institute of Electrical and Electronics Engineers Inc., 2014)We present an efficient approach for broad band one way propagation of light by parallel and unequal dielectric waveguides leading different effective phase shifts. Three dimensional numerical simulations show that 30% ... -
Efficient and broadband guided wave one-way mode-order conversion with theoretical and numerical analysis
Üstün, Kadir; Kurt, Hamza (Optical Society of American (OSA), 2013)In this article, an efficient method of asymmetric conversion of guided modes is investigated. From a basic excitation consisting of (mainly) the lowest-order mode of the input multimode strip waveguide, we achieve a ... -
Large bandwidth mode order converter by differential waveguides
Öner, Bilgehan Barış; Üstün, Kadir; Kurt, Hamza; Okyay, Ali Kemal; Turhan Sayan, Gönül (Optical Society of American (OSA), 2015)In this article, we propose a large bandwidth mode-order converter design by dielectric waveguides with equal lengths but different cross-sectional areas. The efficient conversion between even and odd modes is verified by ... -
Thin wideband infrared metamaterial absorber with coplanar metallic patches of different sizes
Üstün, Kadir; Turhan Sayan, Gönül (Institute of Electrical and Electronics Engineers Inc., 2016)Infrared absorber concept is a vibrant research topic because of the importance of real world applications such as infrared detectors, thermal coolers and energy harvesters. In this paper, we propose and numerically analyze ... -
Ultra-broadband long-wavelength infrared metamaterial absorber based on a double-layer metasurface structure
Üstün, Kadir; Turhan Sayan, Gönül (OSA - The Optical Society, 2017)In this paper, we report a metamaterial absorber design that achieves a broad absorption band encompassing the whole long-wavelength infrared (LWIR) region. The structure consists of two parallel metasurfaces buried in an ... -
Wide bandwidth absorption in the MWIR region using a thin and simple metamaterial absorber
Üstün, Kadir; Turhan Sayan, Gönül (Institute of Electrical and Electronics Engineers Inc., 2017)In this study, metamaterial absorber structures that operate in the mid-wave infrared (MWIR) region are presented. The advantage of the design stems from the high absorptance in the region of interest and the ease of ... -
Wideband long wave infrared metamaterial absorbers based on silicon nitride
Üstün, Kadir; Turhan Sayan, Gönül (American Institute of Physics Inc., 2016)In this paper, we present silicon nitride metamaterial absorber designs that accomplish large bandwidth and high absorption in the long wave infrared (LWIR) region. These designs are based on the metal-insulator-metal ...
